1 /* $Id$ */

     2 

     3 #include "stdafx.h"

     4 #include "openttd.h"

     5 #include "variables.h"

     6 #include "landscape.h"

     7 #include "debug.h"

     8 #include "newgrf.h"

     9 #include "newgrf_callbacks.h"

    10 #include "newgrf_spritegroup.h"

    11 #include "newgrf_canal.h"

    12 

    13 

    14 /** Table of canal 'feature' sprite groups */

    15 const SpriteGroup *_canal_sg[CF_END];

    16 

    17 

    18 /* Random bits and triggers are not supported for canals, so the following

    19  * three functions are stubs. */

    20 static uint32 CanalGetRandomBits(const ResolverObject *object)

    21 {

    22 	return 0;

    23 }

    24 

    25 

    26 static uint32 CanalGetTriggers(const ResolverObject *object)

    27 {

    28 	return 0;

    29 }

    30 

    31 

    32 static void CanalSetTriggers(const ResolverObject *object, int triggers)

    33 {

    34 	return;

    35 }

    36 

    37 

    38 static uint32 CanalGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)

    39 {

    40 	TileIndex tile = object->u.canal.tile;

    41 

    42 	switch (variable) {

    43 		case 0x80:

    44 			return TileHeight(tile);

    45 

    46 		case 0x81:

    47 			return ((_opt.landscape == LT_ARCTIC && GetTileZ(tile) > GetSnowLine()) ? 4 : 0) |

    48 			       (_opt.landscape == LT_TROPIC ? GetTropicZone(tile) : 0);

    49 	}

    50 

    51 	DEBUG(grf, 1, "Unhandled canal property 0x%02X", variable);

    52 

    53 	*available = false;

    54 	return 0;

    55 }

    56 

    57 

    58 static const SpriteGroup *CanalResolveReal(const ResolverObject *object, const SpriteGroup *group)

    59 {

    60 	if (group->g.real.num_loaded == 0) return NULL;

    61 

    62 	return group->g.real.loaded[0];

    63 }

    64 

    65 

    66 static void NewCanalResolver(ResolverObject *res, TileIndex tile)

    67 {

    68 	res->GetRandomBits = &CanalGetRandomBits;

    69 	res->GetTriggers   = &CanalGetTriggers;

    70 	res->SetTriggers   = &CanalSetTriggers;

    71 	res->GetVariable   = &CanalGetVariable;

    72 	res->ResolveReal   = &CanalResolveReal;

    73 

    74 	res->u.canal.tile = tile;

    75 

    76 	res->callback        = 0;

    77 	res->callback_param1 = 0;

    78 	res->callback_param2 = 0;

    79 	res->last_value      = 0;

    80 	res->trigger         = 0;

    81 	res->reseed          = 0;

    82 }

    83 

    84 

    85 SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile)

    86 {

    87 	ResolverObject object;

    88 	const SpriteGroup *group;

    89 

    90 	NewCanalResolver(&object, tile);

    91 

    92 	group = Resolve(_canal_sg[feature], &object);

    93 	if (group == NULL || group->type != SGT_RESULT) return 0;

    94 

    95 	return group->g.result.sprite;

    96 }